Metric Yarn Count
The worsted count was only a rough measurement and has been replaced by more exact methods such as the metric yarn count. However for fine wool, the memory of the older system survives in the S numbers which have a very rough correspondence to worsted count. In other words, fiber that yielded about 80 worsted hanks is roughly comparable to fiber designated as 80s using the S numbers. The critical difference is that while the worsted number was an indirect measure (and a rough one at that) of yarn thickness, the S number is a direct (and precise) measurement of the thickness of the fiber. The S number of fiber, and hence of yarn, fabric, or garments made of that fiber, is determined using the international standard promulgated by the International Wool Textile Organisation (IWTO).
Read more about this topic: S Number (wool)
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